How does a delta work when BW is the source?

Greetings to All,
We are loading from R/3 into DSO1, and then from DSO1 into DSO2. The R/3 extractor that loads DSO1 is delta-enabled. We are not sure, however, if a delta mechanism governs the load from DSO1 into DSO2. The DTP says its extraction mode is delta, but does that mean, if a row in DSO1 changes, it will negate the key figures on the original row and send a new row the way R/3 does?
For example, suppose the R/3 extractor sends us Row 1.
Row 1 has a key figure with a value of $100.
Row 1 gets changed in R/3, and the new value is $125.
The R/3 delta mechanism takes care of this by negating the key figure on the appropriate row and sending us a correcting row. For example, the R/3 extractor will send us:
Row 1 $100
Row 1 -100
Row 1 $125
So... the net value in DSO1 is correct, i.e. 100 - 100 + 125 = 125.
When we load from DSO1 into DSO2, however, do you know what rows will load into DSO2? Is BW "smart" enough to do this type of negation?
Thanks!
Regards,
Sarah-Jane

The R/3 delta mechanism takes care of this by negating the key figure on the appropriate row and sending us a correcting row
The function of negation is not done by R/3 rather by BI with use of before and after images in ODS. R/3 sure does send us the changed records but not the associated negation values in a new row. So if Bi can handle delta with one ODS, sure it can handle others too.
http://help.sap.com/saphelp_bw33/helpdata/en/10/54853b175d214ee10000000a11402f/content.htm
Message was edited by:
voodi

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